Hummer H3. Manual — part 1185
indicates a stronger signal.
Signal Type
This displays whether the Generation 6 OnStar® VCIM is currently operating in a digital or
analog market.
Software ID
This displays the 3-digit number of the software version used on the OnStar® VCIM.
Time
This displays the time as synchronized with GPS Satellites.
Transceiver ID
This displays the ID number of the cellular tower that the OnStar® VCIM is using for
cellular signal.
VCI Module Station ID
This is the station identification number stored in the VCIM which is used by the OnStar®
Call Center.
Year Module Build
This displays the year the module was built.
DTC B0004
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provide an overview of each diagnostic category.
DTC Descriptor
DTC B0004: Vehicle Speed Information Circuit Open
Circuit Description
2007 Hummer H3
2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3
The navigation radio receives the vehicle speed signal from through a dedicated circuit from the
instrument panel cluster (IPC).
Conditions for Running the DTC
The navigation radio detects a power mode transition to ON.
DTC B1327 or B1328 is not set.
The vehicle has driven for 4 km (2.5 mi) after receiving a global positioning system (GPS)
signal.
Conditions for Setting the DTC
The GPS signal indicates that the vehicle has traveled 4 km (2.5 mi) with vehicle speed signal
information received from the IPC.
Action Taken When the DTC Sets
The navigation radio uses the GPS signal when the vehicle speed signal from the IPC is
unavailable.
The following symptoms may happen if the vehicle speed signal from the PCM is unavailable:
The vehicle icon may jump to different positions on the map screen.
The current position marker may not move on the map screen while the vehicle is being
driven.
The route guidance accuracy may be degraded.
Conditions for Clearing the DTC
A current DTC clears when the navigation radio detects the vehicle speed signal from the
IPC.
A history DTC clears after 50 ignition cycles without a vehicle speed signal failure.
Reference Information
Schematic Reference
Radio/Navigation System Schematics
Connector End View Reference
Entertainment/Communication Connector End Views
2007 Hummer H3
2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3
Description and Operation
OnStar Description and Operation
Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
Scan Tool Reference
Scan Tool Data List
Scan Tool Data Definitions
Circuit/System Verification
Drive the vehicle. Verify the scan tool IPC Vehicle Speed parameter displays the actual vehicle
speed.
If the parameter does not display actual vehicle speed, refer to SPEEDOMETER AND/OR
ODOMETER INACCURATE OR INOPERATIVE .
Circuit/System Testing
1. Ignition OFF, disconnect the X2 harness connector at the radio and the X1 harness
connector at the IPC.
2. Test for infinite resistance between the signal circuit terminal E at the radio harness
connector and ground.
If greater than the specified range, test the signal circuit for a short to ground.
3. Ignition ON, test for less than 1 volt between the signal circuit terminal E at the radio
harness connector and ground.
If greater than the specified range, test the signal circuit for a short to voltage.
4. Test for less than 5 ohms between the signal circuit terminal E at the radio harness connector
and the signal circuit terminal 21 at the IPC harness connector.
5. If all circuits test normal, replace the IPC.
Repair Instructions
2007 Hummer H3
2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for IPC replacement, setup and programming.
DTC B1001
Circuit Description
This DTC is generated by the module when an error occurs between the vehicle identification
number (VIN) as received over the class 2 communication circuit and the VIN as stored in the
module memory. The only circuit required is the class 2 communications line.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B1001 Option Configuration Error
Conditions for Running the DTC
The DTC is run when the module changes from OFF to ON. This may be in response to the radio
switch or the ignition ON signal.
Conditions for Setting the DTC
This DTC is generated by the module when an error occurs between the VIN as received over the
class 2 communication circuit and the VIN as stored in the module memory. This happens when
the radio changes from OFF to ON.
Action Taken When the DTC Sets
The module does not function.
Conditions for Clearing the DTC
Re-calibration with the correct calibrations for the vehicle and cycling the module to OFF then to
ON will clear the DTC if there is no damage to the module.
DTC B1001
Step
Action
Yes
No
Schematic Reference: Radio/Navigation System Schematics
Connector End View Reference: Entertainment/Communication Connector End
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2007 Hummer H3
2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3
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